基于SGR算法的断层侧向封闭性评价方法改进及其应用

发布时间：2018-06-26 12:42

本文选题：断层侧向封闭性 + 评价方法改进　；参考：《地质学报》2017年07期

【摘要】：利用Yielding断层侧向封闭性评价方法预测油柱高度过程中,发现断层侧向封闭油气能力与油气分布呈现部分不吻合现象,经过深入研究表明:是由于未考虑断层侧向封闭油气下限以及封闭区域造成的。当断面上某一深度范围内最小断层泥化率(SGR值)大于断层侧向封闭油气下限时,整条断层在该深度范围内对油气具有侧向封闭能力,Yielding断层侧向评价方法可直接应用,其预测结果与油气吻合度较好;而当断面上某一深度范围内最小SGR值小于断层侧向封闭油气下限时,该点在封闭区域之外,按照Yielding预测方法可能会低估或高估断层的侧向封闭能力。为了更准确研究断层侧向封闭性评价方法,因此针对这种情况对断层侧向封闭评价方法进行了改进,并选取冀中坳陷文安斜坡断层型圈闭为例,利用改进后的断层侧向评价方法对断圈侧向封闭能力进行定量评价,结果表明:沙一段1~2号断圈的预测结果与井含油气性相吻合,表明该方法用于定量评价断层侧向封闭性是可行的,更正了Yielding评价方法低估或高估封闭断圈侧向封闭油气的能力,提高了断层侧向封闭能力预测的准确度。
[Abstract]:In the process of predicting oil column height by using Yielding fault lateral sealing evaluation method, it is found that the lateral sealing oil and gas ability of fault is partly inconsistent with oil and gas distribution. The results show that it is caused by the failure to consider the lower limit of fault lateral sealing oil and gas and the sealing area. When the minimum fault gouging rate (SGR) in a certain depth range is larger than the lower limit of fault lateral sealing oil and gas, the whole fault has lateral sealing ability to oil and gas in the range of that depth and Yielding fault lateral evaluation method can be directly applied. The prediction results are in good agreement with oil and gas, and when the minimum SGR value in a certain depth range of fault is less than the lower limit of fault lateral seal oil and gas, the point is outside the closed area. According to Yielding prediction method, lateral sealing ability of faults may be underestimated or overestimated. In order to study more accurately the evaluation method of fault lateral sealing, this paper improves the evaluation method of fault lateral sealing, and takes Wenan slope fault trap in Jizhong depression as an example. The improved fault lateral evaluation method is used to quantitatively evaluate the lateral sealing capacity of fault circle. The results show that the prediction results of fault circle 1 ~ 2 in Shayi formation are in agreement with the well oil and gas content. The results show that this method is feasible to quantitatively evaluate the lateral sealing ability of faults and correct the Yielding evaluation method for underestimating or overestimating the ability of sealing oil and gas in the lateral sealing of fault circles and improving the accuracy of predicting the lateral sealing ability of faults.
【作者单位】：东北石油大学;大庆油田有限责任公司第一采油厂;中国石油华北油田勘探开发研究院;
【基金】：国家自然科学基金项目(编号41372154、41602154) 中国石油科技创新基金(编号2015D-5006-0103) 东北石油大学研究生创新科研项目(编号YHSCX2015-002NEPU)共同资助成果
【分类号】：P618.13

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